Jon,
I have been doing some calculations, and from my preliminary results it seems that a deep black out during no-limits (such as Makula, Pipin and Audrey have had) seems to be from O2 toxicity--only because they don't use any energy during the dive, so their CO2 levels are low, despite the huge pressure.
Variable weight dives result in higher CO2 because of the effort during the ascent, but even then, the diver is quite buoyant, because he/she wears a 7mm wetsuit with no weight belt.
My calculations show that the highest CO2 ever encountered will on the ascent of an 80+m constant weight dive, and, that same dangerous CO2 level will start around 70m and peak between 50m and 40m, and it definitely goes WAY over the critical 70mmHg, but there is the question of time. It seems on my 'accident' dive I was truly approaching that time limit and just about fell asleep at 53m. Come to think of it, it feels like I'm on the edge of falling asleep during the entire ascent on the 80+m dives, a classic symptom of CO2 narcosis/narcolepsy.
Eric
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